InfoPath Dev

I need to create a calculated text field based on two other Combo box on the form The problem is that if another selection is made in the Combo box the text field does not change accordingly since its a sharepoint list form i cant use code behind and because there is no such thing as an if statement...

Program: InfoPath2010 Designer Form: InfoPath 2007 compatible browser-enabled form Scenario: I have a browser-enabled form in which the totals from 4 sections are averaged in a "TotalChecklistCompliance" field. Very simple until... It has been requested that I re-work the average so that a...